北海市涠洲岛西南部海岸形态变化的LiDAR监测

LiDAR Monitor Coast Deformation on Southwest of Weizhou Island in Beihai City

南海周边近年来由于自然灾害和人类活动的影响导致局部区域海岸形态发生了较大变化,尤其是远离大陆的海岛正在遭受越来越严重的破坏或侵蚀,严重威胁到沿岸人民的生产和生活安全。利用中国海监南海航空支队获取的涠洲岛西南部两个时期高密度机载激光雷达点云数据构建了研究区内高精度的数字高程模型。在此基础上,分别获取了研究区内不同年代的坡度、曲率、地面粗糙度、侵蚀与沉积等图层,并选取了20个对比点进行了定量分析和三维展示。结果表明,在选取的研究区域和分析时段内,涠洲岛西南部大部分海岸区域均发生了形变,尤以砂质海岸发生形变的程度最为显著。

Due to the influence of natural damage and human activity, in recent years local regions around South China Sea are occurring greater coast deformation, especially the islands which far away from the mainland are suf- feting more and more serious damage or erosion, and it is a serious threat for the production and life of residents a- long the coast. High-precision DEMs were established in study area using two periods airborne LiDAR point cloud on southwest of Weizhou Island acquired by South China Sea Airborne Detachment of China Marine Surveillance. On this basis, the slope, curvature, surface roughness, erosion and deposition layers were respectively gained in the study area in different years, and 20 contrast points were selected to conduct quantitative analysis and 3D show. The result indicates that in the selected study area and analysis periods, the most coastal zones around southwest of Weizhou Island are arising deformation, especially the deformation in sandy coast are more notable.